The correct answer is: C. PaaS
PaaS (Platform as a Service) is a cloud computing model that provides a platform for developing, testing, and deploying applications. The platform includes a set of tools and services that abstract away the underlying infrastructure, such as servers, storage, and networking. This allows developers to focus on developing their applications without having to worry about the underlying infrastructure.
PaaS is a more refined and restrictive service model than IaaS (Infrastructure as a Service) and CaaS (Compute as a Service). With PaaS, the cloud provider manages the entire platform, including the operating system, middleware, and runtime environment. This makes it easier for developers to get started with cloud computing, but it also means that they have less control over the underlying infrastructure.
IaaS is a cloud computing model that provides access to computing resources, such as servers, storage, and networking. The cloud provider manages the underlying infrastructure, but the customer is responsible for managing the operating system, middleware, and runtime environment. This gives customers more control over the underlying infrastructure, but it also means that they have more responsibility for managing it.
CaaS is a cloud computing model that provides access to computing resources, such as servers, storage, and networking. The cloud provider manages the underlying infrastructure, including the operating system, middleware, and runtime environment. This gives customers the least amount of control over the underlying infrastructure, but it also means that they have the least amount of responsibility for managing it.
In conclusion, PaaS is the most refined and restrictive service model because it provides the most abstraction from the underlying infrastructure. This makes it easier for developers to get started with cloud computing, but it also means that they have less control over the underlying infrastructure.